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New brakes keep squealing

379 Views 10 Replies 6 Participants Last post by  wjbertrand, 
Mpirgousis
2013 mustang gt- Just installed new brembo calipers up front and replaced the whole brake system. I got powerstop drilled and slotted rotors and akebono performance ceramic pads. I keep getting brake squealing when coming to a stop. Sometimes it does it sometimes not. Fairly positive it’s coming from the front but I can’t tell which wheel. Any ideas? Thank you.
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crjackson
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Beechkid
The first thing that comes to my mind is did you "Bed the Brakes".... ie the specific heating/break-in sop? The harder the compound the more likely you are to experience this as well. The brake bed in sop is the most important as it places a layer of brake lining material on the rotors to create a more even bite and eliminate/reduce noise. here is a typical sop....

Brake Burnishing Procedures- Pontiac (old school but simple)
Note: Acceleration allows brakes to cool without warp rotors/drums
Step 1: Brake from 60 to 45 mph @ 20' per second; 150 times; Accelerate 1 mile
Step 2: Brake from 75 to 45 mph @ 25' per second; 50 times; Accelerate 2 miles
Step 3: Brake from 85 to 45 mph @ 28' per second; 25 times; Accelerate 3 miles

Brake Burnishing Procedures- Diversified Cryogenics/Disc
Step 1: 12-24 progressively harder stops, rotor temperature not to exceed 700 degrees F
Step 2: Allow rotors to cool completely. Check rotors to verify smooth finish.
Step 3: 12-24 progressively harder stops, rotor temperature not to exceed 1000 degrees F
Step 4: Allow rotors to cool completely. Check rotors to verify smooth finish.
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Mpirgousis
Beechkid said:
The first thing that comes to my mind is did you "Bed the Brakes".... ie the specific heating/break-in sop? The harder the compound the more likely you are to experience this as well. The brake bed in sop is the most important as it places a layer of brake lining material on the rotors to create a more even bite and eliminate/reduce noise. here is a typical sop....

Brake Burnishing Procedures- Pontiac (old school but simple)
Note: Acceleration allows brakes to cool without warp rotors/drums
Step 1: Brake from 60 to 45 mph @ 20' per second; 150 times; Accelerate 1 mile
Step 2: Brake from 75 to 45 mph @ 25' per second; 50 times; Accelerate 2 miles
Step 3: Brake from 85 to 45 mph @ 28' per second; 25 times; Accelerate 3 miles

Brake Burnishing Procedures- Diversified Cryogenics/Disc
Step 1: 12-24 progressively harder stops, rotor temperature not to exceed 700 degrees F
Step 2: Allow rotors to cool completely. Check rotors to verify smooth finish.
Step 3: 12-24 progressively harder stops, rotor temperature not to exceed 1000 degrees F
Step 4: Allow rotors to cool completely. Check rotors to verify smooth finish.
Click to expand...
akebono markets that these pads do not need to be bedded in. Although I did take it for a drive after and did several 50-10 stops then drove around several minutes to let them cool.
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Forddenial
It doesn't matter if the manufacturer says they don't need to be bedded. I bed EVERY set of brakes i install.
I have a few local stretches where i can (legally) get up to 70mph and brake in 2 second on then 2sec off pumps. I do that for 2-3 rounds.
Not "official" but it works for me. The one time i didn't (rushed brake job) i got a complaint from the customer about sqealing brakes on their drive back from Chicago.

Remember, the Titanic was supposed to be "unsinkable" too.......take those claims with a grain of salt
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Mpirgousis
I will try to bed them tomorrow and see if it makes a difference
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A
1) To find the offending squeaker, life the vehicle, remove the tires and spin the wheels by hand. Take your time and press, pull, tug and what not. A very light, wheel speed dependent frequency background rub is normal. That is your pads on the rotor. Grinding, chattering, shimmying is not.

2) Check your installattion hardware, especially the brake pad clips. Generic stock photo shown below. The clips need to be correctly greased also, or they can result in annoying intermittent squeaks. Ditto your caliper pins and calipers themselves.
Automotive tire Gas Automotive wheel system Machine Auto part


3) As others have insisted, bed your brakes in. Thiis is not optional no matter what the instructions state.

GOOD LUCK!
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Mpirgousis
Bedded then in again today. Still squealing randomly. Just gonna go with a different pad and rotor.
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A
Please do not wave the white flag of surrender so soon.

A far less expensive option than discarding brand new pads and rotors is to take your 'Stang to a local shop. They should be able to diagnose your problem in <1hr.
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Beechkid
Mpirgousis said:
Bedded then in again today. Still squealing randomly. Just gonna go with a different pad and rotor.
Click to expand...
Might try removing the pads, sanding them and the rotors, clean with brake kleen and reinstall. If this doesn't work may I recommend CarboTech Engineering brakes...used them for 30+ years and quiet as can be and excellent stopping, very low dust and very good wear!!!!!!!!!!!!!
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wjbertrand
They make some elastomeric goo that you can spread or spray on the backs of the pads that work to dampen the vibrations that cause the squeaking. For example:


There are other products too.


Sent from my iPhone using Tapatalk Pro
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